Degenerate put off current lecture (11)
I believe the answer is:
deteriorate
'degenerate' is the definition.
(synonyms)
'put off current lecture' is the wordplay.
'put off' becomes 'deter' (both can mean to discourage).
'current' becomes 'I' (symbol for electric current).
'lecture' becomes 'orate' (I've seen this before).
'deter'+'i'+'orate'='DETERIORATE'
(Other definitions for deteriorate that I've seen before include "Fail" , "Grow worse" , "Become steadily worse" , "Go downhill" , "Become slowly worse" .)